#include <iostream>
#include <stdio.h>
using namespace std;

int euclid(int x,int y)
{
    int r;
    while(y)
    {
        r=x%y;
        x=y;
        y=r;
    }
    return x;

}

int main()
{
    freopen("euclid2.in","r",stdin);
    freopen("euclid2.out","w",stdout);
    int t,x,y;

    scanf("%d",&t);

    for(int i=1;i<=t;i++)
    {
        scanf("%d%d",&x,&y);
        printf("%d\n",euclid(x,y));

    }
}